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Subsequent Event - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
0 Months Ended 3 Months Ended 9 Months Ended 0 Months Ended
Apr. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Oct. 01, 2014
Subsequent Event [Member]
Spezialpapierfabrik Oberschmitten GmbH [Member]
Subsequent Event [Line Items]            
Date of acquisition           Oct. 31, 2014
Payment made for acquisition in cash $ 211,000       $ 210,911 $ 10,700
Annual sales   $ 465,952 $ 457,844 $ 1,373,066 $ 1,290,525 $ 33,000